How much to replace (Fix) electric power steering on a ford Focus 2006

What year is this Focus? First you need to work out what the "Clonk" is. Is this clonk only as you turn or does happen when you hit pot holes? The most common reason for a steering/suspension noise is one of the joints on the system. Get the bottom ball joint, the track rod ends and the drop links looked at.
If your car is before 2011 check the fluid level in the power steering. After 2011 they changed to electric power steering. Sometime the stiffness is that easy to fix. If you need to top it up only fill to the MAX line. After topping it up, With the engine running, turn the steering all the way to the left then all the way to the right and repeat it 3 or 4 times. This bleeds the system.
If the joints are all OK you need to look at the actual steering rack.

If it's the electrical motor type of pump, you must connect to a full scale scanner like Lexia 3 to get it reset.

There was an issue with the steering in that 04-11 focus... let me see if I can find the problems they've had for you.

Ford Focus fuel pipe leak (2004-2011 cars)
Cars built between July 2004 and February 2005 could have had problems with their fuel return pipes leaking. The pipes were made from material that degraded over time, allowing fuel to seep out.
Ford Focus wiper motor problem (2004-2011 cars)
On early second-generation cars built between April 2003 and March 2005, there were issues reported with the wiper motor. Water could enter the motor through the arm spindle, and if it contained salt, could short-circuit it and cause the motor to overheat. This could lead to trim melting around the motor.

Ford Focus engine failure problem (2004-2011 1.6 TDCi cars)
1.6 TDCi Focus models built between February and June 2004 might have problems with their engines, causing them to cut out. Misaligned oil feeds between the cylinder heads and camshaft bearings reduced oil flow, causing premature wearing of the camshaft bearings and engine seizure.
Ford Focus brake pedal problems (2004-2011 cars)
Cars built between November 2005 and December 2006 could have developed problems with their brake pedals. In particularly cold weather, the pedal could become stiff, as the non-return valve in the pump began to stick.
Ford Focus roll-over protection problems (2004-2011 CC cars)
On some Ford Focus CC models it was found that there were issues with the roll-over protection system. Securing bolts holding the system in place were either loose or not fully tight. Therefore the protection would not be fully effective. Ford should have fixed this for free, so make sure the work has been carried out.
Ford Focus cooling fan problems (2004-2011 1.6 TDCi estate car)
On some Focus 1.6 TDCi estates built between July 2004 and December 2006 there were problems with the cooling fans. Where roads are particularly salty, corrosion could easily occur, reaching as far as the control module. In extreme cases this could cause it to overheat, which could lead to fire.
Ford Focus rear hub bolt problems (2004-2011 cars)
On some Ford Focus models built between February and April 2007 there were problems with the rear hub bolts. They could come loose because they weren't made to the correct design specification.
Ford Focus power steering problems (2004-2011 cars)
Ford Focus models built between April and May 2008 could have had problems with their power steering. Some of the hoses fitted were not to the required specification. The hoses could degrade and allow hydraulic fluid to seep out, which could either cause the power steering to fail or, in more extreme cases, cause fire when the fluid became hot.
Ford Focus risk of fire problem (2004-2011 cars)
Hatchback and estate 1.6 TDCi Ford Focus models, manual and automatic, built between January 2006 and January 2007 may have a risk of fire unless they've had their cooling fans checked. Salty roads could lead to corrosion, overheating and fire if not sorted.
Ford Focus water leaks (2004-2011 cars)
On second-generation cars, some owners have reported water leaking into the cabin. Check any sunroof or window seals before you buy. Also look for damp carpet inside, because it could have become mouldy if left untreated.
Every one of these issues should have been remedied by Ford for free, so make sure the work has been carried out.

This is a web site people use from home

Price questions you have to ask a repair shop

I believe there are 2 wires to the horn. One is power all the time, and the other is ground through the steering column wire to the horn button on the steering wheel, when it grounds out when pushed.
If it is a single wire to the horn, then there is a relay.

Check the power steering fluid, also check to see if your belts are in tack and powering the motors.

Heavy as in ,stiff steering?
Not usually the pump. It's only money.
Lets go with a worn steering rack,after you check out the strut bearings,being worn/stiff etc.

There are 2 things that cause power steering to go stiff. The power steering pump itself either from failure or "lack of fluid" and the rack and pinion assy under the car.
Most of the time the failure is the power steering pump itself. The teflon rollers fail inside the pump and it either stops providing an output pressure or it seizes up. You can loosen the power steering pump belt then try to rotate the pump by hand. It should move by hand. If it feels like it is intermittently locking up as you rotate, it the teflon rollers have failed and the pump will need to be replaced.

Thanks for using FixYa.

Kelly

its quite quite simple;take your pipes of and block them off reconnect them to new pump and replace pump to in line belts.adrian;;;

Most cars Speedometer cable connect to one of the front wheels, but you said your speedometer sometimes stop then your steering wheel will go stiff, I think you should fix or change your speedometer cable, maybe the cable broken inside. Fix it as soon as possible for your safety.

Speedometer cable has two parts, one is outside cable, mounted and connect to both speedometer and wheel.

The other one is an inside steel cable, outside cable protects the inside cable, because the inside cable turns as soon as you move the car. It is directly connect to the wheel gears and the speedometer inside.

If your car has speedometer cable, I think you need check it right away.

Your steering wheel sometimes stiff, you also need to check your power steering fluid level, sometimes cause this kind problem.

Hope this can help you and if you have more questions, please use whatever the Fixya allowed, contact me to discuss this matter and others. Thank you.